778 SCROPHULARIACEAE 



flexed; lower lip erect. Stamens 4; filaments partly adnate to the corolla-tube. 

 Styles glabrous, united up to the 2-lobed stigma. Capsule loculicidal; placentae 

 separating from the valves, remaining united in the middle, seldom separating. 



Calyx oblique, decidedly inflated in fruit; upper tooth much larger than the rest; corolla 

 yellow. 

 Caly.x-teeth acute; stem neither rooting at the nodes, nor floating. 



Perennials, usually tall and erect, 3-6 dm. high; corolla 2-3.5 cm. long; upper 

 calyx-tooth half longer than the rest. 

 Leaves glabrous; stem pubescent only above. 1. M. Langsdorfii. 



Leaves and stem pubescent tliroughout' 2. A/, puberulus. 



Annuals, slender or low; corolla 2 cm. or less long. 



Corolla 1.5-2 cm. long, at least twice as long as the calyx. 



Stem long, usually slender; upper calyx-lobe about twice as long as the 



rest; calyx red-spotted. 3. M. Jiasutus. 



Stem less than 1 dm. liigh; upper calyx-lobe only slightly longer than the 

 rest; calyx not spotted. 4. M. thermalis. 



Corolla 5-10 mm. long, about half longer than the calyx. 



Plant perfectly glabrous. 5. M. Hallii. 



Inflorescence and caly.x villous-puberulent. 6. M. inicrophyllus. 



Calyx-teeth obtuse; stem decumbent or floating, rooting at the nodes. 



7. M. Geyeri. 

 Calyx neither oblique, nor inflated; its lobes nearly equal. 

 Perennials; flowei-s 1.5-4 cm. long; sepals linear-lanceolate. 

 Corolla crimson or rose. 



Tall, with erect stem, 3-10 dm. high, not stoloniferoxxs. 8. M. Lewisii. 

 Stem 1-2 dm. high, stoloniferous. 9. M. Eastwoodiae. 



Corolla yellow: plant low or slender, weak. 



Stem leafy throughout. 10. M. moschatus. 



Stem leafy only at the base. 15. M. primuloides. 



Annuals; flowers 0.5-2 cm. long; sepals ovate, triangular, or broadly lanceolate. 

 Leaves petioled ; blades cordate to ovate-lanceolate. 



Leaf-blades cordate or broadly ovate, mdistinctly 5-ribbed. 



Corolla 1.5-2 cm. long. 11. ^I. peduncularis. 



Corolla 1 cm. or less long. 



Leaves not very tliin, dark green, decidedly pubescent; stem often 



pm-ple and villous. 12. Af. florihundus. 



Leaves very tliin, membranous, Ught green, glabrous or nearly so; stem 

 very deUcate, wliite. 13. .A/, membranaceus. 



Leaf-blades ovate-lanceolate, tapermg at the base, distinctly 3-ribbed. 



14. i\/. breviflorus. 

 Leaves sessile, oval, oblong, lanceolate or Unear. 

 Corolla yellow; lower lip lobed. 



Leaves basal or nearly so; pedimcle soUtary, scape-like, many times longer 



than the leaves. 15. M. primuloides. 



Leaves scattered; peduncles axillary, scarcely exceeding the leaves. 



Plant villous, 1-4 dm. high; lower lip of the corolla with 2 brown spots. 



16. A/, pilosiis. 

 Plant 1 dm. high or less, glabrous or glandular-puberulent ; corolla 



spotless. 

 Leaves thick. Indistinctly veined; corolla 4-6 mm. long. 



17. M. Sukxdorfii. 

 Leaves thin, more or less distinctly 3-ribbed; corolla about .S mm. 



long. 18. M. gratioloides. 

 Corolla rose-colored; lower Up entire. 



Plant glandular-puberulent. 19. M. rubellus. 



Plant glandiflar-villous. 20. A/. Breweri. 



1. M. Langsdorfii Donn. Stems erect or ascending, 1-10 dm. high, glabrous; 

 lower leaves petioled, the upper sessile or clasping; blades ovate, romided, or 

 subreniform, sinuately dentate or denticulate, 2-7 cm. long, glabrous; calyx 10-15 

 mm. long, puberulent; teeth broadly triangvdar-ovate, acutish; corolla 2-3.5 cm. 

 long, yellow, rarely spotted, bearded inside. M. luleus A. Gray, not L. M. 

 minor A. Nel.s. Swamps and along streams: Sask. — N.M. — Calif. — Alaska; 

 Mex. Submont. — Suhdlp. Ap-Au. 



2. M. puberulus Greene. Stem 2-3 dm. high, viscid-Iiirtcllous; lower 

 leaves petioled, obovate or spatulate, somewhat puberulent; upper stem-leaves 

 sessile, ovate, coarselj' dentate; calyx viscid-puberulent, about 1 cm. long; teeth 

 triangular, acute; corolla yellow, 2-2.5 cm. long, funnclform. Mountains: Colo. 

 Mont. Je-Jl. 



3. M. nasutus Greene. Stem glabrous or minutely puberulent, 1-5 dm. 

 high, 4-angled; lower leaves spatulate, petioled, the upper rounded or reniform, 

 clasping; calyx 6-8 mm. long, puberulent; teeth triangidar, very acute; corolla 



